Inductor component

Abstract

An inductor component includes an element including insulating layers that are laminated, and a coil in the element and helically wound about an axis. The coil includes a first outer coil wiring layer outermost on a first side in a direction of the axis, a second outer coil wiring layer outermost on a second side in the direction of the axis, and at least one inner coil wiring layer between the first and second outer coil wiring layers. The first outer coil wiring layer, the at least one inner coil wiring layer, and the second outer coil wiring layer are laminated while alternating with the insulating layers. The insulating layer between the first outer coil wiring layer and the inner coil wiring layer adjacent to the first outer coil wiring layer in the direction of the axis has a thickness smaller than or equal to 6.5 μm.

What is claimed is: 
     
         1 . An inductor component, comprising:
 an element including a plurality of insulating layers that are laminated; and   a coil in the element and helically wound about an axis,   wherein   the coil includes
 a first outer coil wiring layer outermost on a first side in a direction of the axis, 
 a second outer coil wiring layer outermost on a second side in the direction of the axis, and 
 at least one inner coil wiring layer between the first outer coil wiring layer and the second outer coil wiring layer, 
   the first outer coil wiring layer, the at least one inner coil wiring layer, and the second outer coil wiring layer are laminated while alternating with the plurality of insulating layers,   the insulating layer between the first outer coil wiring layer and the inner coil wiring layer adjacent to the first outer coil wiring layer in the direction of the axis has a thickness smaller than or equal to 6.5 μm, and   the first outer coil wiring layer has a direct current resistance smaller than or equal to 0.18 Ω.   
     
     
         2 . The inductor component according to  claim 1 , wherein
 the insulating layer between the second outer coil wiring layer and the inner coil wiring layer adjacent to the second outer coil wiring layer in the direction of the axis has a thickness smaller than or equal to 6.5 μm, and   the second outer coil wiring layer has a direct current resistance smaller than or equal to 0.18Ω.   
     
     
         3 . An inductor component, comprising:
 an element including a plurality of insulating layers that are laminated; and   a coil in the element and helically wound about an axis,   wherein   the coil includes
 a first outer coil wiring layer outermost on a first side in a direction of the axis, 
 a second outer coil wiring layer outermost on a second side in the direction of the axis, and 
   at least one inner coil wiring layer between the first outer coil wiring layer and the second outer coil wiring layer,   the first outer coil wiring layer, the at least one inner coil wiring layer, and the second outer coil wiring layer are laminated while alternating with the plurality of insulating layers,   the insulating layer between the first outer coil wiring layer and the inner coil wiring layer adjacent to the first outer coil wiring layer in the direction of the axis has a thickness smaller than or equal to 6.5 μm, and   the first outer coil wiring layer has a line length smaller than or equal to 670 μm.   
     
     
         4 . The inductor component according to  claim 3 , wherein
 the insulating layer between the second outer coil wiring layer and the inner coil wiring layer adjacent to the second outer coil wiring layer in the direction of the axis has a thickness smaller than or equal to 6.5 μm, and   the second outer coil wiring layer has a line length smaller than or equal to 670 μm.   
     
     
         5 . An inductor component, comprising:
 an element; and   a coil in the element and helically wound about an axis,   wherein   the coil includes
 a first outer coil wiring layer outermost on a first side in a direction of the axis, 
 a second outer coil wiring layer outermost on a second side in the direction of the axis, and 
 at least one inner coil wiring layer between the first outer coil wiring layer and the second outer coil wiring layer, 
   the first outer coil wiring layer, the at least one inner coil wiring layer, and the second outer coil wiring layer are laminated while alternating with a plurality of insulating layers,   the insulating layer between the first outer coil wiring layer and the inner coil wiring layer adjacent to the first outer coil wiring layer in the direction of the axis has a thickness smaller than or equal to 6.5 μm, and   a ratio of a line length of the first outer coil wiring layer to a cross-sectional area of the first outer coil wiring layer is smaller than or equal to 11 μm −1 .   
     
     
         6 . The inductor component according to  claim 5 , wherein
 the insulating layer between the second outer coil wiring layer and the inner coil wiring layer adjacent to the second outer coil wiring layer in the direction of the axis has a thickness smaller than or equal to 6.5 μm, and   a ratio of a line length of the second outer coil wiring layer to a cross-sectional area of the second outer coil wiring layer is smaller than or equal to 11 μm −1 .   
     
     
         7 . An inductor component, comprising:
 an element; and   a coil in the element and helically wound about an axis,   wherein   the coil includes
 a first outer coil wiring layer outermost on a first side in a direction of the axis, 
 a second outer coil wiring layer outermost on a second side in the direction of the axis, and 
 at least one inner coil wiring layer between the first outer coil wiring layer and the second outer coil wiring layer, 
   the first outer coil wiring layer, the at least one inner coil wiring layer, and the second outer coil wiring layer are laminated while alternating with a plurality of insulating layers, and   when a current twice a rated current is applied, a field strength between the first outer coil wiring layer and the inner coil wiring layer adjacent to the first outer coil wiring layer in the direction of the axis is smaller than or equal to 0.040 V/μm.   
     
     
         8 . The inductor component according to  claim 7 , wherein
 when a current twice the rated current is applied, a field strength between the second outer coil wiring layer and the inner coil wiring layer adjacent to the second outer coil wiring layer in the direction of the axis is smaller than or equal to 0.040 V/μm.   
     
     
         9 . An inductor component, comprising:
 an element; and   a coil in the element and helically wound about an axis,   wherein   the coil includes
 a first outer coil wiring layer outermost on a first side in a direction of the axis, 
 a second outer coil wiring layer outermost on a second side in the direction of the axis, and 
 at least one inner coil wiring layer between the first outer coil wiring layer and the second outer coil wiring layer, 
   the first outer coil wiring layer, the at least one inner coil wiring layer, and the second outer coil wiring layer are laminated while alternating with a plurality of insulating layers,   the first outer coil wiring layer has less than one turn, and   the inner coil wiring layer adjacent to the first outer coil wiring layer in the direction of the axis has one or more turns.   
     
     
         10 . The inductor component according to  claim 9 , wherein
 the second outer coil wiring layer has less than one turn, and   the inner coil wiring layer adjacent to the second outer coil wiring layer in the direction of the axis has one or more turns.   
     
     
         11 . The inductor component according to  claim 1 , wherein
 a line length of the first outer coil wiring layer is smaller than or equal to 670 μm.   
     
     
         12 . The inductor component according to  claim 1 , wherein
 a ratio of a line length of the first outer coil wiring layer to a cross-sectional area of the first outer coil wiring layer is smaller than or equal to 11 μm −1 .   
     
     
         13 . The inductor component according to  claim 1 , wherein
 when a current twice a rated current is applied, a field strength between the first outer coil wiring layer and the inner coil wiring layer adjacent to the first outer coil wiring layer is smaller than or equal to 0.040 V/μm.   
     
     
         14 . The inductor component according to  claim 1 , wherein
 the first outer coil wiring layer has less than one turn.   
     
     
         15 . The inductor component according to  claim 14 , wherein
 the inner coil wiring layer adjacent to the first outer coil wiring layer has one or more turns.   
     
     
         16 . The inductor component according to  claim 1 , wherein
 a width of the first outer coil wiring layer perpendicular to a direction in which the first outer coil wiring layer extends and perpendicular to an axis of the first outer coil wiring layer is greater than a width of the inner coil wiring layer adjacent to the first outer coil wiring layer in a direction perpendicular to a direction in which an axis of the inner coil wiring layer extends.   
     
     
         17 . The inductor component according to  claim 1 , wherein
 a thickness of the first outer coil wiring layer in a direction parallel to the axis is greater than a thickness of the inner coil wiring layer adjacent to the first outer coil wiring layer in the direction of the axis, in a direction parallel the direction of the axis.   
     
     
         18 . The inductor component according to  claim 5 , wherein
 a line length of the first outer coil wiring layer is smaller than or equal to 670 μm.   
     
     
         19 . The inductor component according to  claim 3 , wherein
 a ratio of a line length of the first outer coil wiring layer to a cross-sectional area of the first outer coil wiring layer is smaller than or equal to 11 μm −1 .   
     
     
         20 . The inductor component according to  claim 3 , wherein
 when a current twice a rated current is applied, a field strength between the first outer coil wiring layer and the inner coil wiring layer adjacent to the first outer coil wiring layer is smaller than or equal to 0.040 V/μm.